INTRODUCTION 



In this volume the organization of the various sections has remained unaltered. 

 The cover and title page have been changed in conformity with current biblio- 

 graphical practice. 



We continue our efforts to expand the coverage of the Service. New countries 

 listed are Ireland, Jamaica, and Zambia. As a further example we may mention 

 that the amount of information listed with regard to the developmental biology 

 of unicellular organisms and plants (including slime molds) has increased by 

 nearly 50 %. The number of book notices has again increased considerably. 



Information concerning the Hubrecht Laboratory may be found on page 

 For information regarding the "International Society o[ Developmental BiO' 

 legists" (formerly I.I.E.), including the latest membership list, see page 



P. D. NIEUWKOOP 



T. FABER 



B. Z. SALOME 



